Late Sunday night, a gunman sequestered on the 32nd floor of Las Vegas’s Mandalay Bay resort and casino opened fire on a crowded music festival below in what authorities are calling the deadliest mass shooting in modern U.S. history. At time of writing, the Las Vegas Metropolitan Police Department had confirmed 58 fatalities with 515 people wounded.

According to *The New York Times*, the Route 91 Harvest Festival drew an estimated 22,000 attendees. Shortly after 10 p.m. local time, the suspect began firing on concertgoers gathered to see singer Jason Aldean. The suspect then reportedly killed himself before police reached him. His motive has not yet been nailed down. He is, however, believed to have acted alone.

News of yet another mass shooting has become all too common in recent years; 273 have been reported in 2017 alone, according to the Gun Violence Archive. The staggeringly high incidence of gun-related deaths is enough to make anyone feel frustrated and more than a little helpless. Thankfully, there are things we can all do to help those affected by Sunday’s tragic shooting in Las Vegas. Here are seven ways you can make a difference.

1. Donate blood, especially if you're in the Las Vegas area.

Many of the 500-plus people injured Sunday night will be in need of blood transfusions, and calls are out for blood donations at the Labor Health and Welfare Clinic at 7135 W. Sahara Avenue. United Blood Services is asking for donations at three locations: 4950 W. Craig Road in Las Vegas, and 6930 W. Charleston or 601 Whitney Ranch Drive in Henderson, Nevada. You can also find a blood drive near you via the American Red Cross.

Anyone interested in donating blood in the Las Vegas area would be well-advised to call ahead for available appointments, and to note ahead of time that would-be Nevada donors under the age of 17 will need a signed parental consent form. All donors must be over 110 pounds. Here's more information about the eligibility requirements for donating blood.

On their Web site, UBS notes that they're most in need of O-negative, O-positive, and platelet donations. Keep in mind that even if you're not in the Las Vegas area, donated blood can be shipped (and is generally always needed locally, too), so you can still help.

2. Volunteer.

According to KTNV Channel 13 Las Vegas, volunteers have been showing up at triage centers since last night, bringing with them blankets, water, and other resources people need. Some people offered shelter for the night to those who had been displaced, while some Uber drivers offered people free rides. As roads and hotels reopen today, need for housing and transportation might be somewhat diminished, although if you live in the area, putting out a social media offer to share your open couch is definitely worth a shot.

The Mandalay Bay has also tweeted that they're in need of certified trauma counselors. While they later tweeted that they have enough counselors for today, this is sure to be an ongoing need.

The need for blood donations offers another opportunity to volunteer: You can consider handing out food and water to those waiting to donate. Calling donation centers ahead of time might also yield volunteer opportunities in coming days, like coordinating a blood drive.

3. Send money to families affected by the shooting.

In the wake of a mass shooting, many people will be faced with staggering and unexpected funeral costs for their loved ones. Injured victims and their families will face high hospital bills to cover emergency medical care and whatever rehabilitation might be required after the fact. To help those affected shoulder the financial burden of this sudden tragedy, you can donate to the Las Vegas Victims' Fund on GoFundMe, started by Steve Sisolak, Clark County commission chair. The site is also hosting many other crowdfunding efforts to raise money for victims of the shooting and their families.

4. Share only valid information.

It’s easy to spread misinformation online, especially in the chaos that follows an event like Sunday night’s shooting. But some friends and families of concertgoers are still looking for loved ones, and accidentally sharing misinformation only makes the aftermath of a mass shooting more difficult. If you're a Las Vegas local and you're physically OK, marking yourself “safe” with Facebook’s safety check feature is one option to make sure people are less likely to panic over your wellbeing.

Beyond that, sharing information from vetted sources—like the LVMPD Twitter account or the City of Las Vegas Twitter account—about how to report missing people, where to donate blood, and where to find the family reunification center (400 S. MLK Boulevard, in Building B) is an easily accomplished task that could save someone else much-needed time.

5. Attend a vigil.

Gathering at a vigil might feel like a small thing, but showing support for those affected by the Las Vegas shooting sends an important message of solidarity. Noting that the tragedy “hits especially close to home” in Nashville, Tennessee—home to many of the music festival’s performers—the city’s mayor, Megan Barry announced a vigil to be held Monday night. As was the case after the mass shooting at Orlando’s Pulse nightclub in June 2016, it seems reasonable to expect vigils will take place in cities across the country over the next few days.

6. Contact your congressperson.

A wave of vigils and protests helps send a strong, unequivocal message that the country wants more than flimsy gun laws, but it's also crucial to be clear with your congressperson. People across the country who are fed up with another devastating mass shooting should contact their representatives on the national and local level. Writer Nicole Silverberg put together a comprehensive guide anyone can use to figure out where your representatives stand on gun safety, how to get in touch with them, and exactly how to word your requests. Here's more information on how to talk to your representatives in Congress so they actually listen to you.

Nevadans might find this an especially important activity. The Sagebrush State allows anyone 18 and over to carry a firearm without a permit, and its open-carry laws led former police officer and FBI agent Steve Gomez to compare Nevada to “the wild, wild West” in a conversation with ABC News. While it's illegal for anyone in Nevada (and the rest of the country) except licensed dealers, police, and the military to buy or own new automatic weapons, it's perfectly legal to buy or own ones made before May 1986 and registered with the government. The gunman’s brother reportedly wondered, according to the Times, where the shooter acquired his arsenal, but Nevada's lax gun laws don't make it a difficult thing to accomplish.

Whatever you choose to do, remember even small actions help in the face of grand-scale trauma and become more helpful the more people undertake them. Here at SELF, our thoughts are with everyone affected by Sunday’s tragedy.

Update: This piece has been updated to reflect that it is illegal for anyone except licensed dealers, police, and the military to buy or own automatic weapons made after May 1986.